A 10%+ surge in Seoul trading on Wednesday pushed the Korean memory firm past $1 trillion, making it the third chipmaker after Nvidia and TSMC to cross the line.

SK Hynix’s market capitalisation pushed through $1 trillion in Seoul trading on Wednesday morning, on the back of a single-session rally of more than 10% that briefly tripped circuit breakers on South Korea’s benchmark Kospi index.

The Korean memory firm becomes the third chip company ever to cross the trillion-dollar mark, after Nvidia and TSMC, and the first dedicated memory specialist to do so.The milestone arrives at the end of a stretch that has been, by any normal benchmark, structurally implausible.

SK Hynix’s share price has risen roughly 900% over the past 24 months. Last month, the company sat about $50bn below the trillion-dollar threshold; the closing gap reflects how violently the high-bandwidth memory (HBM) cycle has compressed into the company’s books. Full-year 2026 HBM capacity is sold out. Shortages are forecast to persist through 2027.

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The structural anchor is SK Hynix’s position in Nvidia’s supply chain. UBS estimates the company holds roughly 70% of HBM4 orders for Nvidia’s Vera Rubin platform, which Jensen Huang described in Taipei this week as “probably the largest product launch in the history of Taiwan.”

Each Rubin unit consumes 288GB of HBM4 across eight stacks, and the system is rated at 22 TB/s of system bandwidth. The implied unit economics for SK Hynix are enormous: HBM4 stacks sell at premiums well above commodity DRAM, and Nvidia’s Rubin order book runs into hundreds of thousands of units.

The competitive picture is also unusually friendly. Samsung, the world’s largest memory firm, has spent 2026 visibly behind on HBM4 qualification and is dealing with an industrial-relations dispute that has slowed its memory ramp.

Micron, the third leg of the global memory tripod, has captured a smaller share of the Rubin design wins and a smaller share of the broader HBM market. For now SK Hynix is the producer everyone is queueing for.

The market-cap milestone also lands at the same moment that SK Hynix has been seriously evaluating a US dual listing that would, on the figures being discussed, raise around $14bn.

The trillion-dollar mark gives that listing pricing leverage; it also gives Seoul’s capital-markets authorities a domestic-flagship narrative they will be reluctant to dilute. Which way the dual-listing question resolves is the next decision worth watching.

The harder question is durability. Memory is a famously cyclical business, and the current upcycle is being priced as if it will not end. SK Hynix’s capacity expansion, including the $13bn P&T7 HBM packaging plant, is sized for sustained demand through the back half of the decade. If Nvidia’s Rubin Ultra demand materialises as forecast, the trillion mark holds. If it does not, the historical pattern of memory shares is that they give back a lot of the gain very quickly.

SK Hynix shares closed up 9.8% on Wednesday after intraday gains touched 15%.